15c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)/* 25c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved. 35c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 45c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * This library is free software; you can redistribute it and/or 55c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * modify it under the terms of the GNU Library General Public 65c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * License as published by the Free Software Foundation; either 75c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * version 2 of the License, or (at your option) any later version. 85c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 95c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * This library is distributed in the hope that it will be useful, 105c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * but WITHOUT ANY WARRANTY; without even the implied warranty of 115c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 125c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Library General Public License for more details. 135c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 145c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * You should have received a copy of the GNU Library General Public License 155c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * along with this library; see the file COPYING.LIB. If not, write to 165c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 175c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Boston, MA 02110-1301, USA. 185c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 195c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) */ 205c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 215c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#ifndef StepRange_h 225c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#define StepRange_h 235c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 241e202183a5dc46166763171984b285173f8585e5Torne (Richard Coles)#include "platform/Decimal.h" 25591b958dee2cf159d33a0b931e6231072eaf38d5Ben Murdoch#include "wtf/Forward.h" 265c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 275c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)namespace WebCore { 285c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 295c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)class HTMLInputElement; 305c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 315c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)enum AnyStepHandling { RejectAny, AnyIsDefaultStep }; 325c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 335c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)class StepRange { 345c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)public: 355c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) enum StepValueShouldBe { 365c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) StepValueShouldBeReal, 375c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) ParsedStepValueShouldBeInteger, 385c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) ScaledStepValueShouldBeInteger, 395c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) }; 405c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 415c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) struct StepDescription { 425c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) WTF_MAKE_FAST_ALLOCATED; 435c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) public: 445c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) int defaultStep; 455c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) int defaultStepBase; 465c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) int stepScaleFactor; 475c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) StepValueShouldBe stepValueShouldBe; 485c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 495c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) StepDescription(int defaultStep, int defaultStepBase, int stepScaleFactor, StepValueShouldBe stepValueShouldBe = StepValueShouldBeReal) 505c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) : defaultStep(defaultStep) 515c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) , defaultStepBase(defaultStepBase) 525c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) , stepScaleFactor(stepScaleFactor) 535c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) , stepValueShouldBe(stepValueShouldBe) 545c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) { 555c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 565c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 575c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) StepDescription() 585c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) : defaultStep(1) 595c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) , defaultStepBase(0) 605c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) , stepScaleFactor(1) 615c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) , stepValueShouldBe(StepValueShouldBeReal) 625c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) { 635c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 645c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 655c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Decimal defaultValue() const 665c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) { 675c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return defaultStep * stepScaleFactor; 685c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 695c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) }; 705c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 715c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) StepRange(); 725c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) StepRange(const StepRange&); 735c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) StepRange(const Decimal& stepBase, const Decimal& minimum, const Decimal& maximum, const Decimal& step, const StepDescription&); 745c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Decimal acceptableError() const; 755c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Decimal alignValueForStep(const Decimal& currentValue, const Decimal& newValue) const; 765c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Decimal clampValue(const Decimal& value) const; 775c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) bool hasStep() const { return m_hasStep; } 785c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Decimal maximum() const { return m_maximum; } 795c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Decimal minimum() const { return m_minimum; } 805c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) static Decimal parseStep(AnyStepHandling, const StepDescription&, const String&); 815c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Decimal step() const { return m_step; } 825c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Decimal stepBase() const { return m_stepBase; } 835c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) int stepScaleFactor() const { return m_stepDescription.stepScaleFactor; } 845c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) bool stepMismatch(const Decimal&) const; 855c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 865c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // Clamp the middle value according to the step 875c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Decimal defaultValue() const 885c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) { 895c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return clampValue((m_minimum + m_maximum) / 2); 905c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 915c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 925c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // Map value into 0-1 range 935c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Decimal proportionFromValue(const Decimal& value) const 945c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) { 955c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (m_minimum == m_maximum) 965c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return 0; 975c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 985c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return (value - m_minimum) / (m_maximum - m_minimum); 995c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 1005c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 1015c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // Map from 0-1 range to value 1025c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Decimal valueFromProportion(const Decimal& proportion) const 1035c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) { 1045c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return m_minimum + proportion * (m_maximum - m_minimum); 1055c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 1065c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 1075c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)private: 1085c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) StepRange& operator =(const StepRange&); 1095c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Decimal roundByStep(const Decimal& value, const Decimal& base) const; 1105c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 1115c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) const Decimal m_maximum; // maximum must be >= minimum. 1125c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) const Decimal m_minimum; 1135c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) const Decimal m_step; 1145c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) const Decimal m_stepBase; 1155c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) const StepDescription m_stepDescription; 1165c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) const bool m_hasStep; 1175c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)}; 1185c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 1195c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 1205c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 1215c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#endif // StepRange_h 122